Using this tumbler is easy. Just open the lid and pour in your favorite hot or cold drink. It's great for taking with you on hikes, to work, or just around the house. When you're done, wash it with mild soap and warm water. Don't put it in the dishwasher as it may damage the design. Remember, if you fill it with hot water, the steam might lift the lid a bit, but that's normal. Keep it away from sharp objects to avoid scratches.